|On the Oregon State Capital Grounds|
The Eastern Gray Squirrel is found in Oregon as well. It is well adapted to urban living, and is not quite the nuisance that the native California ground Squirrel can be. While the latter digs burrows and disrupts plantings and the like, the Eastern Gray Squirrel is a tree dweller. It lives and nests in trees, and is quite adept at traveling along overhead communications cables.
It is visibly different in appearance from the California ground squirrel in that it's tail is more bushy, it often has a tinge of brown color and a distinctive white chest/belly. It can also climb down a tree head first.
It takes it's name from having been first described in the Carolinas, and while native to the the eastern North America, it has been introduced in the West, and also in Europe and the UK where it has become common.
Additional information: see Wikpedia - California_ground_squirrel